Trying to build beta stirling engine

Discussion on Stirling or "hot air" engines (all types)
austin
Posts: 2
Joined: Mon Nov 13, 2017 2:34 pm

Trying to build beta stirling engine

Postby austin » Mon Nov 13, 2017 2:49 pm

I'm working on building a beta type stirling engine for school but before I move on to fabrication of the engine I would like to make sure my dimensions and ratios are correct for the engine to run. I am planning to make this engine vertical.
Here is a sketch of my dimensions

https://docs.google.com/document/d/18ew ... sp=sharing

The hot cylinder will be: 55mm long and 18mm wide
The cool cylinder will be: 36mm long and 18mm wide
My displacer will be: 36mm long and 17mm wide
My power piston will be: 10mm long and fit in the cool cylinder
Strokes: Both strokes for the pistons will be 20mm long

Can anyone help verify that this engine if built correct will run? Thank you so much.

thanh-cuibap
Posts: 149
Joined: Tue Sep 06, 2016 8:09 am
Location: Việt Nam

Re: Trying to build beta stirling engine

Postby thanh-cuibap » Mon Nov 13, 2017 7:41 pm

Hi austin !
You can check :
viewtopic.php?f=1&t=2231

Ian S C
Posts: 1983
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: Trying to build beta stirling engine

Postby Ian S C » Tue Nov 14, 2017 2:20 am

As the bore for the displacer and power piston is the same, the stroke of the displacer must be increased to obtain the ratio of 1.5 : 1, ie 20 mm stroke for the power piston, 30 mm stroke for the displacer.
This is the second motor that I built in 1994, its still going strong. Its based on Dyna, a motor designed by James G. Rizzo in "The Stirling Engine Manual", and "Modelling Stirling and Hot Air Engines"
Ian S C
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